The questionably traditional practice of being forced to run around a lawn, quad or yard with one's trousers down one's ankles, as a result of being 'whitewashed' in a bar game, i.e. beaten all points to
nil. Almost exclusively
the reserve of public schoolboys and
Oxbridge undergraduates.
Little Jimmy lost 11-0 to Tarquin at table football and so was
trousered; much merriment ensued at the sight of Jimmy
feebly waddling round the quad, and Tarquin and his buddies had a jolly good laugh about the
trousering.